Cable Modem Maintenance Data Encoding via Pilot Signal
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Solution Overview
Problem
Current test equipment modules for HFC networks are limited by high power consumption, cost, size, and integration requirements, making them unsuitable for widespread deployment in host network devices without significant additional resources.
Innovation Solution
A compact, low-power test equipment module that communicates maintenance data to a PNM server using a pilot signal encoded with maintenance parameters, eliminating the need for a cable modem and reducing power and cost by utilizing existing communication networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional test equipment modules are deployed in HFC networks, then network maintenance data can be collected, but power consumption, cost, and device size increase significantly
Solution Approach 1:
The cable modem is designed to perform multiple functions: it provides standard DOCSIS data communication services while simultaneously acting as a test equipment module for network maintenance. The modem captures downstream spectrum, generates maintenance measurements, and communicates test data back to the PNM server, eliminating the need for separate dedicated test equipment in the field.
2Reliability
If traditional test equipment modules are deployed in HFC networks, then network maintenance data can be collected, but device cost and complexity increase
Solution Approach 1:
The invention merges the test equipment functionality with the existing cable modem infrastructure. The measurement system, pilot signal generator, and spectrum capture capabilities are integrated into the cable modem firmware and hardware, combining maintenance monitoring functions with standard data communication services in a single device.
3Adaptability or versatility
If cable modems are used for maintenance data communication, then existing infrastructure can be utilized, but additional power and resources are required at subscriber premises
Solution Approach 1:
The cable modem uses its own operational resources and existing communication channels to perform maintenance monitoring functions. It leverages its built-in spectrum capture capability, uses available downstream frequency bands for pilot signal injection, and communicates maintenance data back through its existing upstream communication path, requiring no additional external power or hardware resources.
Data Source
AI summary
A test equipment module and method of communicating maintenance data in a cable system is disclosed. The module comprises a receiver, a measurement system, a pilot generator, and a signal encoder. The receiver receives downstream signals from a host communication network. The measurement system determines a maintenance parameter value associated with the downstream signals. The pilot generator generates a pilot within the downstream frequency band, and a signal encoder encodes the pilot with the maintenance parameter value. The pilot generator adds the encoded pilot to the downstream signals in the communication network, such that a cable modem in the network can receive the encoded pilot and generate a spectrum that includes the encoded pilot. A PNM server receives the spectrum from the cable modem and determines the maintenance parameter value from the spectrum.